Sun System? Pro Sun 630W Commercial Fixtures combine with Sun System? 1 reliability and Etelligent controllability. This commercial greenhouse fixture is designed and assembled with premium components and superior construction for the professional horticultural enthusiast. Thermally optimized non-air cooled aluminum ballast housing does not require a cooling fan. Advanced 105 kHz microprocessor is designed specifically to drive two 315 lamps at sustained peak performance. Internal ballast programming will protect the fixture in instance of open circuit, short circuit, over/under voltage or high temperature exposure. Features internal built-in circuit breaker. The Pro Sun 630W has dimmable/selectable wattage, turbo and built-in green LED lights for easily identified self-diagnostic performance codes. Low current, staggered ignition delay feature eliminates circuit inrush overload and protects lamp for increased lumen maintenance. Our optic is engineered for high performance based on proven, patented designs. Features UL listed, double-ended sockets. 95% reflective textured PVD aluminum delivers excellent uniformity, output and diffusion. Improved spectrum 315 lamps used in this fixture focus on the red component for increased photosynthetic response. Includes Convertible Smart Volt? Dual Ferrite Power Cord 120-240 volt 6.5 ft with 120 and 240 volt plugs. 277 volt fixture includes a hard-wired 6 ft 277 volt power cord with a L7-15p 277 volt twist lock plug. 347 volt fixture includes 8 ft cord with a L24-20P 347 volt twist lock plug. Compliant with both FCC Article 18 Part A (governs commercial use) and FCC Article 18 Part B (governs residential use) as tested by an independent U.S. testing lab in a "true as used" configuration.